It sounds very much like you have purchased a "Goodybag", rather than added PAYG credit.
The Goodybags buy you a defined amount of data (the amount varies depending on ££s spent), and free inclusive calls (to most numbers) for a period of a month, at which point it all expires.
For PAYG use you need instead to add "Credit" which is defrayed as and when calls are made/data is used. Credit does not expire (though I think you need to use the phone at least every 6 months or a year or something or the SIM is deactivated).
The call charges for PAYG on GiffGaff are not cheap, but it is real PAYG, and for a few calls can be cost effective.
If you find you need bundled data and or calls for the odd sub-month period, it is entirely possible to buy a "Goodybag" from any remaining credit.
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